{
  "manageEntity": {
    "action": "Save",
    "entityId": "329744562",
    "entityType": "Track",
    "nonce": "0xbc2653c850533d1ef1df14e18f5ab7c7f6bf6025d3b45e3747a9efffcf8a70b7",
    "signature": "0xa60693f29d9f4445a8c28b1bc6dfa10b2c3e74402b4d418b5b52b75a2ba4a44c4f7ef938ab56e5447de7aa9133f8ca67451a5ea291801de689fa2019fadb76bd1c",
    "signer": "0x639B9598C075dEDFE2d8FfB1B5B6ca259D3C425E",
    "userId": "667809204"
  }
}